15
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Percent or Percentage effectively means hundredth. So if 1% of a number is 45, then 45 is 1/100 of the number you require, namely (100/1) x 45 = 4500 Then if 15% of a number is 45, then 45 is 15/100 of the number you require, namely :- (100/15) x 45 = 300
The GCF is 15.
15
The discount is 15% of 45 = 45*15/100 = 6.75 The sale price is 45 - 6.75 = 38.25.
45 / 3 = 15 15 x 3 = 45 So 45 is a multiple of 3.